One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(13,14,18,21)(15,22,26,23)(16,27,20,17)(19,24,28,25)(5,6)(7,10)(8,9)(11,12)(13,15,17,25,18,26,27,24)(14,19,20,22,21,28,16,23)(2,4)(6,9)(10,12)(13,16,17,14,18,20,27,21)(15,23,25,19,26,22,24,28)(5,7)(6,10)(8,11)(9,12)(13,17,18,27)(14,16,21,20)(15,24,26,25)(19,22,28,23)(7,11)(10,12)(13,17,18,27)(14,16,21,20)(15,25,26,24)(19,23,28,22)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.